rate.
Confirmed by Alina to be a drop rate of more than 20%.
Still available for owners of LegionSoulSeekerPet.
Also see:
Bright SoulSeeker (AC).
Bright SoulSeeker (Legend).
LegionSoulSeekerPet.
Obsidian SoulSeeker.
SoulSeeker Battle Pet.
Thanks to Dannyg64 and Warlord126.

Soulforge, and empowered by the rage and hatred of those who have passed on. This sword was made to stamp out all things good and beautiful.
Notes:
Also see:
Bright SoulSeeker (AC).
LegionSoulSeeker.
LegionSoulSeekerPet.
Obsidian SoulSeeker.
SoulSeeker Battle Pet.
Thanks to ingomarelementary.